An analysis of planetary boundary layer depth climatic features based on ERA 40 dataset
In order to acquire large scale distribution and climatic cycle features of planetary boundary layer (PBL) depth, based on daily ERA 40 PBL depth dataset, the global PBL depth distribution and seasonal evolution are investigated by means of climatic feature fields such as seasonal cycle, annual difference, which are divided into 4 time levels and computed through statistical method. Result shows that there is a direct relation between thicker PBL depth and planetary surface property, e.g. plateaus or deserts. Continental thicker PBL depth distribute is characterzed by an 8 o'clock pattern, that is, over the continents the thicker PBL depth center lies around the longitude of local time 8 o'clock. Over oceans there are two large intra-monthly variability bands between 30 to 40 latitudes in north and south hemisphere respectively, both bands are consistent with the strong atmospheric baroclinic and active weather system regions. Monthly mean daily difference of PBL depth shifts northward and southward with seasonal circulation. The result is helpful to overall understanding and scientifical application of ERA 40 PBL depth dataset.
ERA 40 datasetPlanetary boundary layer (PBL) depthLarge scale patternSeasonal cycle
国家科技期刊平台
NSTL
万方数据
